hi everyone,

A different problem in using a more accurate metric than the FLRW metric is how we interpret the CMB. The following seems to be the first paper on this. Since "real" calculations are difficult, the approach seems to be to test various toy model calculations that at least show how much things could change compared to FLRW + Concordance parameter values. The answer in this case is not Omega_Lambda = 0, but since these are toy models, i don't think this is a claim that Omega_Lambda != 0. What Krzysztof does argue is that \Delta \Omega_\Lambda_{\mathrm{sys}} \gg 0.01.

The effect of inhomogeneities on the distance to the last scattering surface and the accuracy of the CMB analysis - Krzysztof Bolejko http://arxiv.org/abs/1101.3338

pozdr boud